How do you set power levels? That’s a feature I use extensively.

A feature of mere perceived usefulness. Not to be confused with an actual useful feature.

Why doesn't it need a turntable?

No idea, it seems to cook things pretty evenly, but if I'm say pre-cooking potatoes for 6 minutes before frying them, I do manually turn every couple minutes to be sure. If you want a turntable this is not the one for you, but the ease of the turn-and-it's-on UX destroys any other concern here for me.

Afaik models without turntables rotate the emitter instead.

Some use a "stirring" fan with metal blades, which is designed to reflect the microwaves to all parts of the oven cavity.